Completion of Arenal Deeps ramp

Completion of Arenal Deeps ramp

Orosur Mining Inc.

Orosur Mining Inc (‘OMI’ or the ‘Company’) (TSX: OMI) (AIM: OMI), the South American focused gold producer and explorer, today announces that the development of the Arenal Deeps ramp and lateral waste development to enable production from transverse stopes has been completed. Ore development is underway and stoping is planned to commence by the end of February. Completion of the ramp and lateral development will enable the Company to access higher grade transverse stope ore at Arenal Deeps for the first time in the last quarter of the financial year ending 31 May 2013.

David Fowler, CEO, commented: “I am very pleased to have achieved this important milestone which is a credit to San Gregorio management and employees who have developed the first underground mine in Uruguay over the past two years. This achievement has also importantly been achieved during this fiscal year as San Gregorio has transitioned from contractor development to owner operated development to reduce costs.”

A video showing the Arenal Deeps ramp development is accessible at www.orosur.ca or at http://vimeo.com/orosur/review/58626389/3352b050a1

ENDS

For further information, please contact:

Orosur Mining Inc
David Fowler, CEO
Ignacio Salazar, CFO + 562 9246800; [e-mail]

Canaccord Genuity Limited (Nominated Adviser & Joint Broker)
Andrew Chubb / Ross Allister, [phone]

Seymour Pierce (Joint Broker)
Stewart Dickson / Jeremy Stephenson [phone]

Blythe Weigh Communications (Public Relations and Investor Relations)
Paul Weigh: [phone]
Robert Kellner: [phone]

About Orosur Mining Inc.

Orosur Mining Inc. is a fully integrated gold producer and exploration company focused on identifying and developing gold projects in Latin America. The Company operates the only producing gold mine in Uruguay (San Gregorio), and has assembled an exploration portfolio of high quality assets in Uruguay and Chile. The Company is quoted in Canada (TSX: OMI) and London (AIM: OMI).